Method and apparatus for reducing oscillatory camshaft torque in an internal combustion engine
US6758184B1 · kind B1 · utility
4Cited by
2References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 5, 2003 |
| Grant date | Jul 6, 2004 |
| Priority date | — |
| Expiry date | Jun 5, 2023 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01M2001/0261
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A peristaltic piston pump driven by a dedicated pump cam disposed on a camshaft of an engine. A plurality of valve-opening cams are also disposed along the camshaft. The pump cam has a plurality of lobes equal in number to the number of valve cams and each pump lobe is disposed at 180° from a valve cam lobe such that the camshaft valve torque and secondary oil pump camshaft torque partially cancel, reducing overall camshaft torque oscillation. The pump includes a lost-motion shuttle and spring to permit continuous response of the pump to the cam.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.